well, if you have the $$$, then i'd say metal halide for veg, and hps for flowering.. depending on how much room one has to grow would determine the wattage..
if your trying to grow on a budget, cfl's work great for veg and ok for flowering if you've got enough lumens..
t5's are another great option for vegging plants and or mother plants.. they aren't as cheap as say cfl's, and can sometimes cost almost as much as hid's, but are a great investment imho, and you can always add them to the flowering bulbs, whichever one may choose..